silverlight 滚动效果

  < Canvas  xmlns ="http://scheR_156_11845@as.microsoft.com/client/2007"   
           xmlns:x ="http://scheR_156_11845@as.microsoft.com/winfx/2006/xaml" >
    < Canvas.triggers >
        < Eventtrigger  RoutedEvent ="Canvas.Loaded"   >
            < BeginStoryboard >
                < Storyboard  x:Name ="animation"  repeatBehavior ="Forever"   >
                    < DoubleAnimation  Storyboard.TargetName ="ScrollingRight"
                   Storyboard.TargetProperty ="(Canvas.Left)"   From ="10"  To ="360"  Duration ="0:0:10"    />
                    < DoubleAnimation  Storyboard.TargetName ="ScrollingLeft"
                   Storyboard.TargetProperty ="(Canvas.Left)"  From ="360"  To ="-100"  Duration ="0:0:10"    />
                    < DoubleAnimation  Storyboard.TargetName ="ScrollingUp"
                   Storyboard.TargetProperty ="(Canvas.Top)"  From ="300"  To ="-60"  Duration ="0:0:10"    />
                    < DoubleAnimation  Storyboard.TargetName ="ScrollingDown"
                   Storyboard.TargetProperty ="(Canvas.Top)"  From ="-30"  To ="360"  Duration ="0:0:10"    />
                </ Storyboard >
            </ BeginStoryboard >
        </ Eventtrigger >
    </ Canvas.triggers >

    < TextBlock  x:Name ="ScrollingRight"  FontFamily ="Comic Sans MS"  FontSize ="36"  Foreground ="Green"  
                  text ="向右"  Canvas.Top ="0"   />
    < TextBlock  x:Name ="ScrollingLeft"  FontFamily ="Comic Sans MS"  FontSize ="36"  Foreground ="Red"
                  text ="向左"  Canvas.Top ="50" />      
    < TextBlock  x:Name ="ScrollingUp"  FontFamily ="Comic Sans MS"  FontSize ="36"  Foreground ="Blue"
                  text ="向上"  Canvas.Left ="80"   />  
    < TextBlock  x:Name ="ScrollingDown"  FontFamily ="Comic Sans MS"  FontSize ="36"  Foreground ="Black"
                  text ="向下"  Canvas.Left ="200"   />  
</ Canvas >